condition mean min max ZT0-3 26.675366666666665 23.6794 30.40085 ZT4-7 25.28 25.28 25.28 ZT8-11 20.485500000000002 20.485500000000002 20.485500000000002 ZT12-15 28.2655 28.0683 28.462699999999998 ZT16-19 25.737650000000002 25.737650000000002 25.737650000000002 ZT20-23 29.2837 29.2837 29.2837